In NCS version 3.2.0, if I change the MCUboot partition size to 64KB, the system fails to start.

[bzhou]

ncs: v3.2.0

chip: nRF54L15

If I set CONFIG_PM_PARTITION_SIZE_MCUBOOT=0x10000 (64K), MCUboot fails to boot, and the error displayed is: 'Protect mcuboot flash failed, cancel startup.'

This is because I configured the MCUboot region size as 64K in NCS 3.1.1, so I need to maintain a 64K size when upgrading to NCS 3.2.0.

How can I fix this error?

[Vidar Berg]

Hi,

The bootloader now enables read and write protection on itself before booting the application, but this requires that the bootloader region does not exceed 62 kB as explained here:

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/device_guides/nrf54l/dfu_config.html#nvm_protections 

Since 64K is required in your case to keep compatibility with existing devices, I don't see any other workarounds than to disable this protection in the bootloader (CONFIG_FPROTECT=n).

Best regards,

Vidar

[bzhou]

Thank you for you support.